【作者】 林传塔； 吴峰； 朱祚金；

【Author】 LIN Chuan-ta~1 WU Feng~2 ZHU Zuo-jin~1 (1.Department of Thermal Science and Energy Engineering,University of Science and Technology of China Hefei 230026, 2.Department of Modern Mechanics,University of Science and Technology of China,Hefei 230026)

【机构】 中国科学技术大学热科学与能源工程系； 中国科学技术大学近代力学系；

【摘要】 本研究描述了入口雷诺数为1200(以边界层动量厚度定义)的湍流平板边界层的直接数值模拟(DNS)。空间上发展的湍流平板边界层,其边界层厚度沿主流方向是逐渐增加的,这否定了在计算中通过采用周期性边界条件以避免计算区域过大的可行性。因此,如何在尽可能小的计算区域上得到真实合理的流场,就成了湍流边界层数值模拟的主要问题.本研究通过变尺度(rescaling)方法提取下游截面的速度分布作为入口边界条件,在很大程度上减小了主流方向的计算区域,同时,计算得到的湍流统计平均量也能够与现有的实验和数值模拟结果较好地吻合。更多还原

【Abstract】 A direct numerical simulation of spatially-developing turbulent plane boundary layers with an inlet Reynolds number of 1200(defined by the momentum boundary layer)is described.The turbulent boundary layer is increasing in the streamwise direction,prohibiting the application of periodic boundary condition to avoid large simulation domain.So,how to get a realistic boundary flow in a small domain is the particular problem in the numerical simulation of turbulent boundary layer.In this paper,we employ a rescaling method to extract the downstream velocity field to be the inlet boundary condition,which has greatly decreased the simulation domain in the streamwise direction.Based on this rescaling method,the predicted turbulence statistics was found to have a good agreement with the existed numerical results.更多还原